1 to collapse

2 to crumble

3 to fall apart

1 enemy

2 classifier: 个 gè

1 unequalled

2 without rival

3 a paragon

1 public enemy

1 predator

2 natural enemy

1 counter soldiers with arms, water with an earth weir (idiom); different situations call for different action

2 to adopt measures appropriate to the actual situation

1 evenly matched (idiom)

1 to convert an enemy into a friend (idiom)

1 an ant hole may cause the collapse of a great dike (idiom)

2 huge damage may result from a moment's negligence

1 anger against a common enemy (idiom); joined in opposition to the same adversary